The Cadillac ATS is the smallest vehicle in the lineup. The smaller proportions of the ATS are almost identical to the BMW 3-Series, leaving the significantly larger CTS as an alternative to mid-sized luxury offerings. The ATS coupe is offered with two different engines, in both rear-wheel-drive and all-wheel-drive models. With an available six-speed manual transmission, the ATS is clearly aimed at its segment rivals. Like other Cadillac models, the ATS is offered in a range of trim level packages including, Luxury, Performance, and Premium. With prices ranging from $38,000 to over $50,000, the ATS is priced competitively with its German rivals.

Cadillac adds a coupe variant to the ATS line for the 2015 model year. Built on the same platform as the sedan, the coupe is offered with similar engine and driveline options. In coupe form, engine choices include a 2.0l turbocharged four-cylinder rated at 272-bhp and a 3.6l V6 rated at 321-bhp. Both rear-wheel-drive and all-wheel-drive models are available.